If you look closely at the locomotive of the train that inserts Beckett and Miller, the QR symbol of the Queensland Rail can be seen on the side. Queensland was the state of Australia where this movie was shot.
Historically, Thomas Becket was the archbishop of Canterbury in England from 1162 until he was martyred in 1170, during the reign of King Henry II. He was the eponymous protagonist, portrayed by Richard Burton in the film Becket (1964)
When Miller is firing his weapon at his shadow at the church and the weapon runs out of ammo you can hear numerous clicks of the firing pin as he pulls the trigger. With the model of weapon he carries once it is empty the weapon will not dry fire.
Becket is seen to be "deburring" a round with a knife. An real sniper would never do such a thing. Any alteration to the jacket of the round would alter the ballistics of the round (possibly quite severely). If anything a rag would be used to wipe the round down. And if handled correctly, a match grade round wouldn't have any burrs.
Thomas Beckett: Let me tell ya somethin' - sittin' in an office giving men orders to kill is the same thing as puttin' a bullet in someone's heart yourself. The same. Goddamn. THING.
What are the differences between the British DVD Version and the original R-Rated Version?
A
Both versions exhibit a different cutting sequence. Concerning the cutting of various scenes, the R-Rated version is faster and more suspenseful than the UK version. With the exception of the censorship of one scene of violence, only scenes are missing that were slowing the film down and did not add anything important to the story. A detailed comparison between both versions with pictures can be found here (scenes missing in the R-Rated Version) and here (scenes missing in the UK Version)